I’ve used windshield washer fluid sparingingly.
I don’t have a sunroof

 

I don't have a sunroof, so i'm just blindly guessing. Theoretically all of the water should flow out the tube before it can freeze, so I'm thinking a partial blockage in the tube is the root cause.

The drain runs down under the windshield molding, so I would pop that off and use a hair dryer.

 

That's a decent idea, but I'm not savvy enough for it. I think the blockage is right at the bottom where it let's out so it' aa real pain. I'l ttry the hair dryer from there!

 

Try some rubbing alcohol down the tube.

 

Twice in the past month, I've noticed sitting water/ice in my sunroof gutter. The first time, it was so much that it actually back up, leaked down the pillar and soaked my floor. Second time, I caught it early.
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Both times, I naturally tried to poke through whatever was clogging it. I use a copper wire, weasel my way in between the door, and wiggle the wire as best I can. Usually in the past, this works. However, this winter the outlet has been clogged by way of ice, so the wire doesn't immediately work out. I'm just jiggling at the ice. Eventually I pour some hot water down the drain and it manages to melt the ice enough to let me poke through and fix it... But this has never happened before in the 3 winters I've had the car. Why is it happening now?

I finally broke down and set an appointment in a couple days with the dealer to have them blow some air though the drains to make sure there's nothing physically blocking/freezing it up.. But that's gonna cost a darn hundred dollars and I'm not happy about it.

 

Why pay anyone, much less a DEALER, to do such a simple task ?
My Hvac drain on my house will clog up periodically (mold not ice). Pour some bleach down the drain, let sit for a couple hours, then blow it through.

Same technique could apply to the sunroof drain.

 

This is super unhelpful. Why would I pay someone to do something if I could do it myself? I obviously don't have the proper equipment to blow it myself.

 

Sorry. Not trying to be "unhelpful".
What proper equipment ? You can take a piece of small hose stick it in the drain up top and blow through with lung power. Most clogs aren't going to be hard to clear.
If you need a little more air pressure, ask a friend or relative for an air compressor. BUT. Beware here. If the clog is really tight, you could blow the drain line apart if you use too much air pressure.

Just trying to save you from having to overpay some Dealer $100 that you said you weren't happy about.

 

Its not too tight to pop the connection for sure. When it's above freezing, I generally don't have this happen anymore. But it's been freezing this winter, so it must be something small enough to freeze up the X outlet.

 

Using compressed air could cause the hose joints to separate, so lung power is best to blow out debris